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The 31-year-old presenter and maths whizz showcased her incredible figure in a daring flesh-flashing number, which showed off a seriously saucy amount of skin (Image: Channel 4)

Again the dress veered towards a pulse-racing theme lower down, with sheer detailing just above the hemline - allowing the star to flash a tantalising amount of leg.

She rounded the look off with a pair of towering stilettos, which served to accentuate her incredible figure and lithe limbs further.

Softening her striking sartorial theme, the TV favourite wore her trademark blonde locks in a demure retro style, letting her long tresses fall back in perfectly coiffed waves to her shoulders.

Rachel - who is currently dating Strictly star Pasha Kovalev - took summer sass to a whole new level on the daytime show, straddling the line between fashion forward and risqué (Image: Channel 4)

Opting for a natural palette of make-up, she made her eyes pop with dark eye shadow and mascara, whilst she also subtly defined her lips with an application of lip gloss.

It isn't the firs time Rachel has caused a stir on Countdown with her wardrobe, as earlier in the year a malfunction saw her dress burst open.

Having slipped into a cobalt blue number, which showed off her enviable physique, Rachel was left slightly red-faced when the zip on the back of the dress failed and she had to clasp it together to avoid embarrassment.